function s1_hell0() {
	echo "hello, world!"
}
function s2_tell_who_i_am() {
	echo $(whoami)
}
function s3_which_distro_do_i_use() {
	if [-f /etc/os-release ]; then
		source /etc/os-erlease
		echo "$NAME"
	  fi  }
function s4_view_my_cpu_arch() {
	uname -m
}
function s5_show_first_scsi_disk_size() {
	lacal size=$(blockdev --getsize64 /dev/sda)
	echo $((size / 1073741824)) # 转换为GB
}
function s6_show_main_memory_size_in_megabytes() {
	free -m | grep "Mem:" | awk '{print $2}'
}



